How to check if Ruby on rails has caching activated?

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How to check if Ruby on rails has caching activated?

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#1 by (2 votes)

1

I'm doing a procedure to store the cache in a query to the database in rails, but when I try to test the functionality in the console it does not work for me. It does not save the record in the cache.

I'm using

Rails 5.2.2
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]

Query the post database

class PostsSearchService
  def self.search(curr_posts, query)
    posts_ids = Rails.cache.fetch("posts_search/#{query}", expires_in: 1.hours) do
      curr_posts.where("title like '%#{query}%'").map(&:id)
    end

    curr_posts.where(id: posts_ids)
  end
end

Query in the console rails

PostsSearchService.search(Post.all, "lorem")

Result of the console

Running via Spring preloader in process 12312
Loading development environment (Rails 5.2.2)
irb(main):001:0> PostSearchService.search(Post.all, "lorem")
Traceback (most recent call last):
        1: from (irb):1
NameError (uninitialized constant PostSearchService)
irb(main):002:0> PostsSearchService.search(Post.all, "lorem")
  Post Load (0.5ms)  SELECT "posts".* FROM "posts" WHERE (title like '%lorem%')
  Post Load (0.3ms)  SELECT  "posts".* FROM "posts" WHERE "posts"."id" = ? LIMIT ?  [["id", 18], ["LIMIT", 11]]
=> #<ActiveRecord::Relation [#<Post id: 18, title: "In doloremque ducimus sint.", content: "Accusamus dolores ab. Beatae accusamus eos. Omnis ...", published: false, user_id: 2, created_at: "2019-01-04 06:42:20", updated_at: "2019-01-04 06:42:20">]>
irb(main):003:0> PostsSearchService.search(Post.all, "lorem")
  Post Load (0.6ms)  SELECT "posts".* FROM "posts" WHERE (title like '%lorem%')
  Post Load (0.2ms)  SELECT  "posts".* FROM "posts" WHERE "posts"."id" = ? LIMIT ?  [["id", 18], ["LIMIT", 11]]
=> #<ActiveRecord::Relation [#<Post id: 18, title: "In doloremque ducimus sint.", content: "Accusamus dolores ab. Beatae accusamus eos. Omnis ...", published: false, user_id: 2, created_at: "2019-01-04 06:42:20", updated_at: "2019-01-04 06:42:20">]>

My doubts:

How do I activate the cache in the development environment?
- According to guides.rubyonrails.org I should use rails dev:cache , but it still does not work.
Check the configuration of my ../config/environments/development.rb file and it seems normal, except when I use the recommendation of guides.rubyonrails.org I get the following error.
- config/environments/development.rb:21:in block in ': undefined method megabytes' for 64:Integer (NoMethodError)
How do I prove that rails are writing in the cache?

Thank you in advance for the help you can give me

ruby-on-rails ruby cache

asked by vifrac 04.01.2019 в 19:38

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1 answer

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score 2 · Answer 1

You could use the .read method or put some output inside the block to verify that it is caching:

[11] pry(main)> Rails.cache.fetch('qwer') { puts 'cacheando'; 1234 }
cacheando
=> 1234
[12] pry(main)> Rails.cache.fetch('qwer') { puts 'cacheando'; 1234 }
=> 1234
[13] pry(main)> Rails.cache.read('qwer')
=> 1234

There are other methods in ActiveSupport :: Cache :: Store that could help you debug your problem.

Related to your error undefined method megabytes , I could not tell you. I am currently working with 4.2.x and it works for me, but I see that in the latest documentation of 5.2.2 it is included the method you mention . What you could do is use 67108864 , which is equivalent to 64MB:

[14] pry(main)> 64.megabytes
=> 67108864